I have one that does something like 30 gal per day and it works great for my waterfarms (which I think needs about 25 gal for a res change) I heard you can get them for really good prices on E-bay....I have had some bad experiences shopping on E-bay so I don't shop there but perhaps you like the thrill....you really don't need 100gpd for your setup....I still like Bear's idea of trying some distilled first...see how you like it.....